[Equest-users] Multizone heating question

[James Hansen]

I looked at your .inp file - with a multizone system, you have the
heating coil of the dual duct scenario running all the time - it doesn't
look like you can set the minimum flow rate thru this coil to 0, which
means theoretically there is always a heating load, and perhaps the
boiler is running constantly during FAN ON conditions.  Just a guess.
Also, you have the heating and cooling setpoints at the same temp (68
degrees).  From my experience, you don't want to do this...it may cause
unexpected problems, especially when you are talking about multiple
thermostats controlling a complicated dual duct system.

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

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www.ghtltd.com <http://www.ghtltd.com/> 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daly,
Matt
Sent: Thursday, December 11, 2008 1:57 PM
To: Marcus Eliason
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Multizone heating question

 

Yes, where is your weather file?

My guess is, your chilled air stream needs to be mixed with heated air
to raise it to a proper zone temperature.

 

 

Matt Daly * Project Manager * Willamette ESD 
2611 Pringle Road SE * Salem, OR 97302 
503-385-4693 * fax 503-540-2959

matt.daly at wesd.org <mailto:matt.daly at wesd.org>  

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Karen
Walkerman
Sent: Thursday, December 11, 2008 10:37 AM
To: Marcus Eliason
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Multizone heating question

 

I'm happy to look at your inp file, but I can't open it with eQuest.  My
initial guess is that you have a pilot on all summer, or that your
boiler is cycling at an inefficient part load ratio in response to small
demands.

--
Karen

On Thu, Dec 11, 2008 at 1:25 PM, Marcus Eliason <meliason at essexco.com>
wrote:


Hello,

I am modeling an existing building with multizone air handlers with
chilled
water coils for cooling and hot water coils for heating.  The hot water
is
generated by a gas furnace.  I am seeing some discrepancies in my gas
usage
from actual to the simulation.  In the actual building, the gas usage is
only  high in the winter months (the building is in the south) and is
next
to nothing in summer months.  I have tried all the various methods of
coil
control under the "heating" tab and cannot get the simulation to reflect
the
real life usage.  Does anybody have any ideas on how to control the
heating
better?  Representative files are attached.

Marcus Eliason


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